Electric wrench
By adopting a two-stage planetary gear train and impact mechanism, the electric wrench design solves the problem of insufficient torque in existing electric wrenches in confined spaces, achieving high torque output and miniaturized design, making it suitable for operation needs in confined spaces.
Patent Information
- Application Number
- CN202423050347.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-10
AI Technical Summary
Existing electric wrenches are difficult to use effectively in confined spaces due to their large overall diameter, and the existing reduction gear mechanism design results in insufficient torque output.
The two-stage planetary gear reduction transmission mechanism, combined with the impact mechanism, ensures that the maximum tightening torque reaches 1500 N·m, and controls the outer diameter and length of the reduction transmission mechanism within 70 mm and 50 mm, respectively, to achieve a miniaturized wrench design.
While achieving high torque output in confined spaces, the outer diameter and length of the electric wrench are controlled, supporting its effective application in confined spaces.
Smart Images
Figure CN223573050U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electric tool technical field, in particular to a kind of electric wrench. BACKGROUND
[0002] Electric wrench is a tool for tightening and loosening bolt and nut, current electric wrench adopts single-stage planetary gear train to reduce transmission to motor rotor, the whole diameter of electric wrench is too large, which is not conducive to operation in narrow space. UTILITY MODEL CONTENT
[0003] Based on the above defects in the prior art, the utility model aims to provide an electric wrench, which adopts two-stage planetary gear train to ensure that the maximum tightening torque of the electric wrench is at least 1500N·m, and is also conducive to the miniaturization design of the electric wrench.
[0004] Therefore, the utility model provides the following technical scheme.
[0005] The utility model provides a kind of electric wrench, the electric wrench includes:
[0006] Shell body;
[0007] Motor, which is arranged in the shell body and has motor driving shaft;
[0008] Speed reduction transmission mechanism, which includes first-stage planetary gear train and second-stage planetary gear train, the motor driving shaft, the first-stage planetary gear train and second-stage planetary gear train are sequentially transmission matched;
[0009] Wherein, the outer diameter of the speed reduction transmission mechanism is ≤70mm, the length of the speed reduction transmission mechanism is ≤50mm, the speed reduction transmission mechanism is configured to provide a total reduction ratio of at least 13:1, and the maximum tightening torque of the electric wrench is at least 1500N·m.
[0010] Optionally, the electric wrench further includes an impact mechanism, a main shaft and an output shaft located in front of the main shaft, the impact mechanism includes a striking block, a spring and first balls, the striking block is sleeved on the outer periphery of the main shaft, the main shaft is transmission matched with the second-stage planetary gear train, and the main shaft drives the output shaft to move through the impact mechanism;Wherein, the outer diameter of the striking block is ≤77mm.
[0011] Optionally, the outer diameter of the shell body is ≤105mm.
[0012] Optionally, the first-stage planetary gear train comprises a first sun gear, a plurality of first planetary gears, a first inner ring gear and a first planet carrier, the first sun gear is arranged at an end of the motor driving shaft, the first inner ring gear is mounted on an inner wall of the housing, and the first planetary gears are mounted on the first planet carrier and mesh with the first sun gear and the first inner ring gear respectively.
[0013] Optionally, the second-stage planetary gear train comprises a second sun gear, a plurality of second planetary gears, a second inner ring gear and a second planet carrier, the second sun gear is integrally formed on the first planet carrier, the second inner ring gear is mounted on an inner wall of the housing, and the second planetary gears are mounted on the second planet carrier and mesh with the second sun gear and the second inner ring gear respectively.
[0014] Optionally, the electric wrench comprises a main shaft, and the second planet carrier is integrally formed at an end of the main shaft.
[0015] Optionally, the second inner ring gear abuts against a front end surface of the first inner ring gear.
[0016] Optionally, the first planet carrier comprises a main body and a plurality of first planet pins, the first planetary gears are mounted on the first planet pins one by one, and the second sun gear is located on a side of the main body away from the first planet pins; and two ends of the main body extend into the first inner ring gear and the second inner ring gear respectively.
[0017] Optionally, a needle bearing is arranged between the first planetary gears and the first planet pins.
[0018] Optionally, the second planet carrier is mounted on the inner wall of the housing through a rolling bearing.
[0019] The electric wrench has the following technical effects:
[0020] The electric wrench provided by the utility model adopts two-stage planetary gear trains, can ensure that the maximum tightening torque of the electric wrench is at least 1500N·m, can control the outer diameter of the speed reduction transmission mechanism to be less than 70mm and control the length of the speed reduction transmission mechanism to be less than 50mm, and is beneficial to the miniaturization design of the electric wrench while ensuring the large torque output. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is a structure sectional view of the electric wrench of the utility model;
[0022] Figure 2 It is a structure sectional view of the electric wrench of the utility model; Figure 1 It is an enlarged view of A in the middle;
[0023] Figure 3 It is a local structure explosion drawing of the electric wrench of the utility model.
[0024] BRIEF DESCRIPTION OF DRAWINGS
[0025] 100, electric wrench;
[0026] 1, housing; 11, head housing; 12, gear box housing; 13, gear box rear cover; 14, motor housing; 15, handle housing;
[0027] 2, motor; 21, motor drive shaft;
[0028] 3, speed reduction mechanism; 31, first stage planetary gear train; 311, first sun gear; 312, first planetary gear; 313, first inner ring gear; 314, first carrier; 3141, main body part; 3142, first planet pin; 32, second stage planetary gear train; 321, second sun gear; 322, second planetary gear; 323, second inner ring gear; 324, second carrier; 3241, second planet pin;
[0029] 4, impact mechanism; 41, impact block; 411, annular cavity; 42, spring; 43, second ball; 44, gasket;
[0030] 5, main shaft;
[0031] 6, output shaft;
[0032] 71, needle roller bearing; 72, rolling bearing. DETAILED DESCRIPTION
[0033] In order to make the technical scheme and beneficial effects of the utility model more obvious and easy to understand, the following will be described in detail by enumerating specific embodiments. Unless otherwise defined, the technical and scientific terms used in this paper have the same meaning as the technical and scientific terms in the technical field to which this application belongs.
[0034] In the description of the utility model, unless otherwise explicitly defined, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of the simplified description of the utility model, and is not indicative of the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, that is, it cannot be understood as a limitation on the utility model.
[0035] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.
[0036] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0037] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.
[0038] In this utility model, "front" and "rear" refer to... Figure 1 The markings in the text shall prevail.
[0039] The following is based on Figures 1 to 3 This utility model describes the electric wrench in detail.
[0040] In this embodiment, such as Figures 1 to 3As shown, the electric wrench 100 comprises a housing 1, a motor 2 and a speed reduction transmission mechanism 3, the housing 1 is used to form the outer contour structure of the electric wrench 100, the motor 2 is arranged in the housing 1 and has a motor driving shaft 21, the speed reduction transmission mechanism 3 comprises a first stage planetary gear train 31 and a second stage planetary gear train 32, the motor driving shaft 21, the first stage planetary gear train 31 and the second stage planetary gear train 32 are sequentially transmission matched, and the rotation speed output by the motor 2 is sequentially transmitted through the first stage planetary gear train 31 and the second stage planetary gear train 32. The outer diameter of the speed reduction transmission mechanism 3 is ≤70mm, the length of the speed reduction transmission mechanism 3 is ≤50mm, the speed reduction transmission mechanism 3 is configured to provide a total speed reduction ratio of at least 13:1, and the maximum tightening torque of the electric wrench 100 is at least 1500N·m.
[0041] By adopting the above technical scheme, by adopting two-stage planetary gear trains, it can be ensured that the maximum tightening torque of the electric wrench 100 is at least 1500N·m, and at the same time, the outer diameter of the speed reduction transmission mechanism 3 can be controlled within 70mm and the length of the speed reduction transmission mechanism 3 can be controlled within 50mm, which is beneficial to the miniaturization design of the electric wrench 100 while ensuring large torque output.
[0042] In an embodiment, as shown in Figure 1 The electric wrench 100 further comprises an impact mechanism 4, a main shaft 5 and an output shaft 6 located in front of the main shaft 5. The impact mechanism 4 comprises a striking block 41, a spring 42 and a first ball (not shown in the figure). The striking block 41 is sleeved on the outer periphery of the main shaft 5, and the inner wall of the striking block 41 is provided with an annular recess 411. The annular recess 411 contains a second ball 43. One end of the spring 42 abuts against the main shaft 5, and the other end abuts against the second ball 43, and a gasket 44 is arranged therebetween. The inner wall of the striking block 41 is provided with a first guide groove (not shown in the figure), and the outer wall of the main shaft 5 is provided with a second guide groove (not shown in the figure). The first guide groove and the second guide groove jointly form a guide ball channel, and the first ball is movably located in the guide ball channel. The main shaft 5 is transmission matched with the second stage planetary gear train 32. The motor driving shaft 21 drives the main shaft 5 to rotate through the speed reduction transmission mechanism 3. The main shaft 5 drives the striking block 41 to move through the first ball. The striking block 41 drives the output shaft 6 to move to output working power. The outer diameter of the striking block 41 is ≤77mm, which is beneficial to reducing the outer diameter of the whole machine.
[0043] Further, the outer diameter of the housing 1 is ≤105mm, and the electric wrench 100 is small in radial structure.
[0044] In an embodiment, as shown in Figure 2 and Figure 3As shown, the first stage planetary gear train 31 includes a first sun gear 311, four first planetary gears 312, a first inner ring gear 313 and a first planet carrier 314, the first sun gear 311 is provided at the end of the motor driving shaft 21, the first sun gear 311 can be sleeved at the end of the motor driving shaft 21, or the two can be integrally formed. The first inner ring gear 313 is mounted to the inner wall of the housing 1, and the first planetary gears 312 are mounted to the first planet carrier 314 and respectively mesh with the first sun gear 311 and the first inner ring gear 313. Of course, the number of first planetary gears 312 is not limited to four, which can be adjusted according to the requirement of the speed reduction ratio.
[0045] Further, as shown in Figure 2 and Figure 3 , the second stage planetary gear train 32 includes a second sun gear 321, four second planetary gears 322, a second inner ring gear 323 and a second planet carrier 324, the second sun gear 321 is integrally formed with the first planet carrier 314, the second inner ring gear 323 is mounted to the inner wall of the housing 1, the second planet carrier 324 is provided with a plurality of second mounting holes, the second planet pin 3241 is mounted in the second mounting hole, and the second planetary gear 322 is mounted to the second planet pin 3241 of the second planet carrier 324 and respectively mesh with the second sun gear 321 and the second inner ring gear 323. Of course, the number of second planetary gears 322 is not limited to four, which can be adjusted according to the requirement of the speed reduction ratio.
[0046] In an embodiment, as shown in Figure 2 , the second planet carrier 324 is integrally formed with the end of the main shaft 5, which is beneficial to the compactness of the structure.
[0047] In an embodiment, as shown in Figure 2 , the second inner ring gear 323 abuts against the front end face of the first inner ring gear 313, which is beneficial to reducing the axial dimension of the electric wrench 100.
[0048] Further, as shown in Figure 2 , the first planet carrier 314 includes a main body part 3141 and four first planet pins 3142, the main body part 3141 is provided with a plurality of first mounting holes, the first planet pin 3142 is mounted in the first mounting hole, the first planetary gear 312 is mounted to the first planet pin 3142, and the first planetary gear 312 and the first planet pin 3142 are provided with a needle bearing 71, and the second sun gear 321 is located on the side of the main body part 3141 away from the first planet pin 3142. The two ends of the main body part 3141 respectively extend into the first inner ring gear 313 and the second inner ring gear 323, and the main body part 3141 is accommodated in the internal space of the first inner ring gear 313 and the second inner ring gear 323, which is beneficial to reducing the axial dimension of the electric wrench 100.
[0049] In an embodiment, as shown in Figure 1As shown, the second carrier 324 is mounted to the inner wall of the housing 1 through the rolling bearing 72, and since the second carrier 324 is integrally formed with the main shaft 5, the rolling bearing 72 supports the second carrier 324 and also supports the rear end of the main shaft 5.
[0050] In an embodiment, as shown in Figure 3 and As shown, the housing 1 comprises a head shell 11, a gear box shell 12, a gear box rear cover 13, a motor shell 14 and a handle shell 15 arranged in sequence from front to rear, the gear box shell 12 is connected with the head shell 11 and the gear box rear cover 13 respectively, and the three together form a transmission chamber, the impact mechanism 4 and the main shaft 5 are located in the head shell 11, one end of the output shaft 6 is located in the head shell 11 to drive the impact block 41, the other end of the output shaft 6 extends to the outside of the head shell 11, and the speed reduction transmission mechanism 3 is located in the gear box formed by the gear box shell 12 and the gear box rear cover 13.
[0051] It should be understood that the above embodiments are exemplary and are not intended to include all possible embodiments encompassed by the claims. Various modifications and changes can also be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, any combination of the technical features of the above embodiments can also be made to form additional embodiments of the present application which can not have been explicitly described. Therefore, the above embodiments only express several embodiments of the present application, and do not limit the protection scope of the present application.
Claims
1. A power wrench characterized by, The electric wrench (100) comprises: a housing (1); a motor (2) arranged in the housing (1) and having a motor driving shaft (21); a speed reduction transmission mechanism (3) comprising a first-stage planetary gear train (31) and a second-stage planetary gear train (32), the motor driving shaft (21), the first-stage planetary gear train (31) and the second-stage planetary gear train (32) being sequentially transmissionally matched; wherein the outer diameter of the speed reduction transmission mechanism (3) is ≤70mm, the length of the speed reduction transmission mechanism (3) is ≤50mm, the speed reduction transmission mechanism (3) is configured to provide a total speed reduction ratio of at least 13:1, and the maximum tightening torque of the electric wrench (100) is at least 1500N·m.
2. The power wrench of claim 1, wherein, The electric wrench (100) further comprises an impact mechanism (4), a main shaft (5) and an output shaft (6) located in front of the main shaft (5), the impact mechanism (4) comprising a striking block (41), a spring (42) and first balls, the striking block (41) being sleeved on the outer periphery of the main shaft (5), the main shaft (5) being transmissionally matched with the second-stage planetary gear train (32), and the main shaft (5) driving the output shaft (6) to move through the impact mechanism (4); wherein the outer diameter of the striking block (41) is ≤77mm.
3. The power wrench of claim 2, wherein, The outer diameter of the housing (1) is ≤105mm.
4. The power wrench of any one of claims 1-3, wherein, The first-stage planetary gear train (31) comprises a first sun gear (311), a plurality of first planetary gears (312), a first inner ring gear (313) and a first planetary carrier (314), the first sun gear (311) being arranged at the end of the motor driving shaft (21), the first inner ring gear (313) being mounted on the inner wall of the housing (1), and the first planetary gears (312) being mounted on the first planetary carrier (314) and respectively meshing with the first sun gear (311) and the first inner ring gear (313).
5. The power wrench of claim 4, wherein, The second-stage planetary gear train (32) comprises a second sun gear (321), a plurality of second planetary gears (322), a second inner ring gear (323) and a second planetary carrier (324), the second sun gear (321) being integrally formed on the first planetary carrier (314), the second inner ring gear (323) being mounted on the inner wall of the housing (1), and the second planetary gears (322) being mounted on the second planetary carrier (324) and respectively meshing with the second sun gear (321) and the second inner ring gear (323).
6. The power wrench of claim 5, wherein, The electric wrench (100) comprises a main shaft (5), and the second planetary carrier (324) is integrally formed at the end of the main shaft (5).
7. The power wrench of claim 5, wherein, The second inner ring gear (323) abuts against the front end face of the first inner ring gear (313).
8. The power wrench of claim 7, wherein, The first planetary carrier (314) comprises a main body (3141) and a plurality of first planetary pins (3142), the first planetary gears (312) are installed on the first planetary pins (3142) one by one, and the second sun gear (321) is located on a side of the main body (3141) away from the first planetary pins (3142); both ends of the main body (3141) extend into the first inner ring gear (313) and the second inner ring gear (323) respectively.
9. The power wrench of claim 8, wherein, Rolling pin bearings (71) are arranged between the first planetary gears (312) and the first planetary pins (3142).
10. The power wrench of claim 5, wherein, The second planetary carrier (324) is installed on the inner wall of the shell (1) through rolling bearings (72).